The AD7746ARUZ is a 2-channel 24-bit High Resolution Capacitance to Digital Converter with temperature sensor. The capacitance to be measured is connected directly to the device inputs. The architecture features inherent high resolution (24-bit no missing codes, up to 21-bit effective resolution). Each channel can be configured as single-ended or differential. The Σ-Δ capacitance to digital converter (CDC) is designed for floating capacitive sensors. The parts have an on-chip temperature sensor with a resolution of 0.1°C and accuracy of ±2°C. The on-chip voltage reference and the on-chip clock generator eliminate the need for any external components in capacitive sensor applications. The parts have a standard voltage input, which together with the differential reference input allows easy interface to an external temperature sensor, such as an RTD, thermistor or diode. The AD7745 has a 2-wire I2C-compatible serial interface.
New standard in single chip solutions
Interfaces to single or differential floating sensors
4fF Accuracy
0.01% Linearity
Common-mode (not changing) capacitance up to 17pF
Tolerant of parasitic capacitance to ground up to 60pF
(EN)
